AutoCodes – Generic – P174B

P174B Code - Valve 4 In The Sub-Gearbox 1 Electric Fault

Quick Answer

The Engine Control Module (ECM) monitors the Valve 4 In The Sub-Gearbox 1. Common causes include Faulty Valve 4 In The Sub-Gearbox 1, Valve 4 In The Sub-Gearbox 1 harness is open or shorted, Valve 4 In The Sub-Gearbox 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P174B indicates Valve 4 In The Sub-Gearbox 1 Electric Fault.
Common causes: Common causes include Faulty Valve 4 In The Sub-Gearbox 1, Valve 4 In The Sub-Gearbox 1 harness is open or shorted, Valve 4 In The Sub-Gearbox 1 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,410

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P174B Description

The Engine Control Module (ECM) monitors the Valve 4 In The Sub-Gearbox 1. The ECM sets the OBDII code when the Valve 4 In The Sub-Gearbox 1 is not to factory specifications.

OBDII Code P174B - Valve 4 In The Sub-Gearbox 1 Electric Fault - AutoCodes.com — P174B Code - Valve 4 In The Sub-Gearbox 1 Electric Fault

What does this mean?

What are the Possible Causes of the DTC P174B?

Faulty Valve 4 In The Sub-Gearbox 1
Valve 4 In The Sub-Gearbox 1 harness is open or shorted
Valve 4 In The Sub-Gearbox 1 circuit poor electrical connection

How to Fix the DTC P174B?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P174B code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P174B code?

Need more information on how to fix the P174B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P174B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P174B Audi — Valve 4 In The Sub-Gearbox 1 Electric Fault
P174B Volkswagen — Valve 4 In The Sub-Gearbox 1 Electric Fault

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P174B Code

1. What are the common symptoms of OBDII code P174B (Valve 4 In The Sub-Gearbox 1 Electric Fault)?

Symptoms may include harsh shifting, transmission slipping, reduced fuel efficiency, and the transmission going into limp mode.

2. What are the possible causes of OBDII code P174B?

Possible causes include a faulty valve 4 in the sub-gearbox 1, electrical issues, damaged wiring, or a malfunctioning transmission control module.

3. How can I diagnose OBDII code P174B?

Diagnosis typically involves using an OBDII scanner to retrieve the code, checking the transmission fluid level and condition, inspecting the wiring and connectors related to valve 4 in the sub-gearbox 1, and performing a thorough visual inspection.

4. Can I continue driving with OBDII code P174B present?

It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission. It is best to address the issue promptly.

5. How serious is OBDII code P174B?

This code indicates a fault in the transmission system, which can lead to drivability issues and potential transmission damage if not addressed in a timely manner. It should be taken seriously.

6. How can I repair OBDII code P174B?

Repair options may include replacing the faulty valve 4 in the sub-gearbox 1, repairing damaged wiring or connectors, resetting the transmission control module, or seeking professional help from a mechanic.

7. Can I reset OBDII code P174B on my own?

You can attempt to clear the code using an OBDII scanner, but it is important to address the underlying issue causing the fault before doing so. If the problem persists, it is recommended to seek professional assistance.

8. Are there any DIY tips for fixing OBDII code P174B?

While some basic checks like inspecting wiring connections can be done DIY, complex repairs involving the transmission system should be handled by trained professionals to avoid further damage.

9. How common is OBDII code P174B in vehicles?

This code is not as common as some other OBDII codes, but it can still occur in vehicles with electronically controlled transmissions, especially in cases of electrical faults or component failures.

10. Is OBDII code P174B covered under warranty?

Coverage may vary depending on the vehicle's warranty status, age, and mileage. It is advisable to check with the manufacturer or your warranty provider to determine if repairs related to this code are covered.